Hi Marisa,
Thanks for posting! I had a look at your area on a map. There is a volkstuin complex not so far away which looks very green, maybe there are some noce clean edges to that place which could be good to visit?
Also I see this natural playground area: https://www.denatureluur.nl/
On the webiste I see a contact of mine – Bart, who runs kids nature workshops all over the city. It looks an interesting place with things for adults and kids. I would be looking there also.
Personally, if the area is quite littered and you don’t get a good clean feel from it, I would move on and forage weekly in a cleaner location (the volkstuin area and the nature playground area). And then I would try to adopt some spots to grow my own 🙂
Good luck with it!